After casting, I allow my moulds to cool (they're all treated with Rapine Bullet Mould Prep). They're stored in a wooden box which is stored in my safe. Anyway, checking my moulds after a couple weeks of using them, I found rust developing on my Whitworth mould (and none others). Steel wool removed the rust (no permanent damage) and I've since then treated it with a molybdenum disulfide grease compound.

Why the Whitworth mould (the most expensive of all my moulds) and none others? Was I doing something wrong?

Different iron alloy? Different handling? Gary thats a tough one my friend.
I take my moulds (all Lyman) and douse em good with WD-40 after use and store em in a ziplock that has the inside doused with WD. When its time to cast again a good brushing in acetone degreases em just fine.

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